Hi @TJ Garland ,
I hope you're having a nice day.
According to Microsoft's official guidance, this behavior typically occurs when something is modifying the global Normal.dotm template in the background. The most common causes are:
- A Word add-in (COM add-in, template add-in, WLL file, etc.) that makes changes to the Normal template.
- An auto macro (such as AutoExec or AutoExit) that runs when Word starts or closes.
- Less commonly, a macro virus modifying the template.
To identify the cause, I'd suggest the following troubleshooting steps:
Step 1: Test Word in Safe Mode
- Close all Word windows.
- Press Windows + R.
- Type:
winword /safe

- Press Enter.
- Open a blank document.

If the prompt does not appear in Safe Mode, the issue is likely being caused by an add-in or customization that does not load in Safe Mode.
Step 2: Disable COM Add-ins
- Open Word normally.
- Go to File > Options > Add-ins.
- At the bottom, next to Manage, select COM Add-ins and click Go.

- Clear all checkboxes.
- Click OK and restart Word.
- Test whether the prompt still appears.
If the issue is resolved, re-enable the add-ins one at a time, testing between each change until the problem returns. This will identify the offending add-in.
Step 3: Check the Word Startup Folder
- Microsoft document notes that Word automatically loads templates and add-ins from the STARTUP folder when Word launches.
- Close Word and Outlook.
- Open File Explorer.
- Browse to:
%AppData%\Microsoft\Word\STARTUP

- Move any files found there to a temporary folder on the Desktop.
- Start Word and test again.
If the prompt disappears, move the files back one at a time until the problem reappears.
Step 4: Check for Auto Macros
- Open Word.
- Type Macros into the Search box at the top.
- Select View Macros.

- Look through the list of macros. If you find a macro whose name starts with 'Auto' (such as AutoExec or AutoExit), it may be automatically modifying Normal.dotm. Select the macro and click Delete to remove it and see whether the issue is resolved.
Microsoft document identifies these as macros that can run automatically and modify the Normal template without user interaction.
Step 5: If the Issue Started Recently
Consider whether any of the following were recently installed or updated:
- PDF software
- Grammar/proofing tools
- Document management software
- Postal/shipping software
- Office add-ins
- Antivirus Office integrations
These types of add-ins are common causes of unexpected changes to Normal.dotm.
Also, the document is indicating that a macro virus could modify the Normal.dotm template and cause Word to think the template has been changed. For more information, please check Protect yourself from macro viruses | Microsoft Support
If you only want to stop the prompt while troubleshooting:
- Go to File > Options > Advanced.
- Scroll to the Save section.
- Clear Prompt before saving Normal template.

However, Microsoft document notes that this only suppresses the message and does not address the underlying cause of the modifications to Normal.dotm.
For your reference: You are prompted to save the changes to the Normal.dotm template every time you quit Word | Microsoft Support
I hope this helps. If you need any further assistance, please feel free to leave a comment.
Kind Regards.